4(x-3)=21

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Solution for 4(x-3)=21 equation: 


Simplifying
4(x + -3) = 21

Reorder the terms:
4(-3 + x) = 21
(-3 * 4 + x * 4) = 21
(-12 + 4x) = 21

Solving
-12 + 4x = 21

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '12' to each side of the equation.
-12 + 12 + 4x = 21 + 12

Combine like terms: -12 + 12 = 0
0 + 4x = 21 + 12
4x = 21 + 12

Combine like terms: 21 + 12 = 33
4x = 33

Divide each side by '4'.
x = 8.25

Simplifying
x = 8.25

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